CN113632186A

CN113632186A - Electric reactor

Info

Publication number: CN113632186A
Application number: CN202080021913.5A
Authority: CN
Inventors: 朝日俊行; 小谷淳一; 稻垣繁之; 长崎宽范
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-03-29
Filing date: 2020-03-19
Publication date: 2021-11-09
Also published as: JPWO2020203353A1; WO2020203353A1; US20220108830A1

Abstract

The reactor is provided with: a core body; and a first coil and a second coil wound around the core body with a first central axis and a second central axis extending in the first direction as centers, respectively. The core has: the first core leg and the second core leg are respectively disposed inside the first coil and the second coil. The first coil and the second coil are arranged in a second direction orthogonal to the first direction. The first coil has: a first winding part wound around the first core leg part; and two first terminal parts respectively led out from both end parts of the first winding part. The second coil has: a second winding portion wound around the second core leg portion; and two second terminal portions respectively drawn out from both end portions of the second winding portion. The second coil has the same shape and the same size as the first coil.

Description

Electric reactor

Technical Field

The present disclosure relates to a reactor having a core.

Background

Patent document 1 discloses a conventional composite transformer (reactor) including a single transformer and a plurality of inductors.

The composite transformer disclosed in patent document 1 includes a plurality of windings, a transformer core, and a plurality of inductor cores. The transformer core extends in the axial direction of the winding, and the winding has a plurality of transformer magnetic leg portions that can be wound. The plurality of inductor cores extend in the axial direction of the winding, and each of the inductor cores has a magnetic leg portion for an inductor around which the winding can be wound. In the plurality of inductor cores, the magnetic leg portion for inductor is disposed adjacent to the magnetic leg portion for transformer in a direction orthogonal to the axis of the winding. The plurality of windings are wound around a magnetic leg portion including a transformer magnetic leg portion and an inductor magnetic leg portion, and magnetic fluxes are generated in the transformer magnetic leg portion and the inductor magnetic leg portion by energization.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2012-54484

Disclosure of Invention

The reactor is provided with: core body: and a first coil and a second coil wound around the core body with a first central axis and a second central axis extending in the first direction as centers. The core has: the first core leg and the second core leg are respectively disposed inside the first coil and the second coil. The first coil and the second coil are arranged in a second direction orthogonal to the first direction. The first coil has: a first winding part wound around the first core leg part; and two first terminal parts respectively led out from both end parts of the first winding part. The second coil has: a second winding portion wound around the second core leg portion; and two second terminal portions respectively drawn out from both end portions of the second winding portion. The second coil has the same shape and the same size as the first coil.

Drawings

Fig. 1 is an external perspective view of a reactor according to a first embodiment.

Fig. 2A is a plan view of the reactor shown in fig. 1.

Fig. 2B is a front view of the reactor shown in fig. 1.

Fig. 2C is a side view of the reactor shown in fig. 1.

Fig. 2D is a rear view of the reactor shown in fig. 1.

Fig. 3A is a sectional view at a line IIIA-IIIA of the reactor shown in fig. 2A to 2D.

Fig. 3B is a sectional view of the reactor shown in fig. 2A to 2D at a line IIIB-IIIB.

Fig. 3C is a sectional view at a line IIIC-IIIC of the reactor shown in fig. 2A to 2D.

Fig. 3D is a circuit diagram of a power supply circuit including the reactor in the first embodiment.

Fig. 3E is a side view of the power supply circuit shown in fig. 3D.

Fig. 4 is an external perspective view of a reactor according to a second embodiment.

Fig. 5A is a plan view of the reactor shown in fig. 4.

Fig. 5B is a front view of the reactor shown in fig. 4.

Fig. 5C is a side view of the reactor shown in fig. 4.

Fig. 6A is a sectional view of the reactor shown in fig. 5A to 5C at the line VIA-VIA.

Fig. 6B is a sectional view at line VIB-VIB of the reactor shown in fig. 5A to 5C.

Fig. 6C is a sectional view of the reactor shown in fig. 5A to 5C taken along line VIC-VIC.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, the embodiment described below is only one of various embodiments of the present disclosure. The following embodiments can be variously modified according to design and the like as long as the object of the present disclosure can be achieved.

(1) Summary of the invention

Fig. 1 is an external perspective view of a reactor 1 in the first embodiment. Fig. 2A, 2B, 2C, and 2D are a plan view, a front view, a side view, and a rear view of the reactor 1, respectively. The reactor 1 is a 2-phase magnetic coupling reactor, and has a magnetic coupling function of magnetically coupling the coil 21 and the coil 22 and an inductor function of accumulating or releasing magnetic energy of each of the coil 21 and the coil 22.

The reactor 1 includes

coils

21 and 22 and a core 3. The core 3 has

core legs

301, 302. The coil 21 is wound around the core 3 around a central axis O1 extending in the direction D1. The coil 22 is wound around the core 3 around a central axis O2 extending in the direction D1. The central axis O1 of the coil 21 is parallel to the central axis O2 of the coil 22. The

coils

21 and 22 are arranged in a direction D2 perpendicular to a direction D1 which is a central axis O1 of the coil 21. The coil 21 includes a winding portion 210 wound around the core leg portion 301 and two

terminal portions

211 and 212 drawn out from the winding portion 210. The winding portion 210 has both

end portions

211A, 212A, and is wound around the core leg portion 301 from one end portion 211A to the other end portion 212A of the both

end portions

211A, 212A.

Terminal portions

211 and 212 are led out from both

end portions

211A and 212A of winding portion 210, respectively. The coil 22 includes a winding portion 220 wound around the core leg portion 302 and two

terminal portions

221 and 222 drawn out from the winding portion 220. The winding portion 220 has both ends 221A, 222A, and is wound around the core leg portion 302 from one end 221A to the other end 222A of the both ends 221A, 222A. The

terminal portions

221 and 222 are led out from both

end portions

221A and 222A of the winding portion 220, respectively. The coil 22 has the same shape and the same size as the coil 21. The

coils

21, 22 constitute the coil section 2. Fig. 2A shows an outline of the reactor 1 viewed from a direction D1. Fig. 2B shows an outline of the reactor 1 viewed from a direction D3 perpendicular to the directions D1, D2. Fig. 2C shows an outline of the reactor 1 viewed from a direction D2. Fig. 2D shows an outline of the reactor 1 viewed from a direction D3.

In the present embodiment, since the

coils

21 and 22 have the same shape and the same size, it is not necessary to prepare two types of coils different from each other as the

coils

21 and 22, and thus the reactor 1 can be manufactured easily. Further, in the present embodiment, the one terminal portion 211 of the coil 21 and the one terminal portion 221 of the coil 22 can be positioned at one of both end portions of the coil portion 2, which is a combination of the

coils

21 and 22, in the direction D1. Further, the other terminal portion 212 of the coil 21 and the other terminal portion 222 of the coil 22 can be positioned at the other end of the two end portions of the coil portion 2 in the direction D1. Therefore, the reactor 1 according to the present embodiment is easily connected to an external circuit. In particular, when the reactor 1 is mounted on a wiring board or the like, the terminal portion 211 of the coil 21 and the terminal portion 221 of the coil 22 are connected to a circuit, and the terminal portion 212 of the coil 21 and the terminal portion 222 of the coil 22 are connected to another circuit, the wiring of the wiring board or the like can be simplified. Therefore, the device including the reactor 1 can be downsized. Further, in the present embodiment, in the reactor 1, since the coil 21 and the coil 22 have the same shape, it is possible to make it difficult for a deviation between the current (current waveform) flowing through the coil 21 and the current (current waveform) flowing through the coil 22 to occur.

In the composite transformer disclosed in patent document 1, connection to an external circuit is complicated by the positions of the terminal portions drawn from the plurality of coils, and the circuit configuration may become complicated.

In the present disclosure, the "same shape" does not require strict identity, and may be the same shape to the extent that the same shape can be regarded in the field of coils. For example, the

coils

21 and 22 have the same shape and include: a coil having a shape that when superimposed upon one another, is substantially uniform in profile; coils that can be obtained by the same manufacturing apparatus, but are made in different manufacturing batches; the coils are made of materials mixed by different components and have the same shape; and coils having different cross-sectional shapes of conductive wires forming the

coils

21 and 22. Similarly, the "same dimension" does not require strict identity, and may be the same dimension to the extent that the dimension can be regarded as the same dimension in the coil field. For example, the

coils

21, 22 have the same size, and include, for example: a coil having a dimension that is substantially uniform in profile when stacked upon one another; coils obtained by the same manufacturing apparatus but made in different manufacturing batches; the coils are made of materials mixed by different components and have the same size; and coils having different cross-sectional dimensions of the conductive wires forming the

coils

21 and 22.

The reactor 1 of the present embodiment is used in, for example, a power supply circuit provided in an automobile, a power conditioner for a house or a non-house, an electronic device, or the like.

(2) Structure of reactor 1

(2-1) first embodiment

Hereinafter, a detailed configuration of the reactor 1 according to the first embodiment of the present disclosure will be described. Fig. 3A is a sectional view at a line IIIA-IIIA of the reactor 1 shown in fig. 2A to 2D. Fig. 3B is a sectional view of the reactor 1 shown in fig. 2A to 2D at a line IIIB-IIIB. Fig. 3C is a sectional view at the line IIIC-IIIC of the reactor 1 shown in fig. 2A to 2D.

In the reactor 1, the core 3 magnetically couples the

coils

21, 22 to each other. The core 3 stores or discharges magnetic energy generated by current flowing through one or both of the

coils

21 and 22.

The core 3 has

core leg portions

301, 302, 303 and connecting

portions

304, 305. As shown in fig. 1, in the present embodiment, in the core 3, the

core leg portions

301, 302, 303 are integrally formed. The

core legs

301, 302, 303 extend in the direction D1. The

core legs

301, 302 are aligned in the direction D2. The combination of

core legs

301, 302 and core leg 303 are aligned in direction D3.

The connecting

portions

304, 305 are arranged with a space therebetween in the direction D1. One end portion in the direction D1 of each of the

core leg portions

301, 302, 303 is connected to the connecting portion 304. The other end portions of the

core leg portions

301, 302, 303 in the direction D1 are connected to the connecting portion 305. That is, the

core leg portions

301, 302, 303 are connected by the connecting

portions

304, 305.

The core leg 301 is disposed inside the coil 21. That is, the coil 21 is wound around the core leg 301. The core leg portion 302 is disposed inside the coil 22. That is, the coil 22 is wound around the core leg portion 302. The core leg 303 is disposed outside the

coils

21 and 22. That is, no coil of the coil 21 or the coil 22 is wound around the core leg 303.

A cross section in a plane PL perpendicular to the direction D1 of the

core leg portions

301 and 302 has a substantially rectangular shape in the core 3 shown in fig. 3A. The cross section is not limited to this, and may have other shapes such as a rectangular shape, a rectangular shape having a peripheral edge portion having an arc at least in part, or a circular shape. Further, for example, as shown in fig. 2A, the

connection portions

304, 305 have a rectangular shape when viewed from the direction D1, and have a flat plate shape having arcs at four corners of the rectangular shape, respectively, but are not limited thereto.

In the present embodiment, the core 3 is integrally formed. The integration is not limited to the one-piece structure, and includes a structure in which a plurality of members are joined together with an adhesive or the like. The core 3 is preferably formed of a metal magnetic material. Specifically, the core 3 is formed of a dust core (dust core) made of an alloy such as iron-silicon-aluminum (Fe-Si-Al), iron-nickel (Fe-Ni), or iron-silicon (Fe-Si).

As has been described, in the present embodiment, the

coils

21, 22 have the same shape. The coil 21 is formed of a conductive wire wound around the core leg 301 (center axis O1) around the core leg 301 and having a flat cross section, and the core leg 301 extends along the center axis O1 extending in the direction D1. The coil 22 is formed of a conductive wire wound around the core leg 302 with the core leg 302 (center axis O2) as the center and having a flat cross section, and the core leg 302 extends along the center axis O2 extending in the direction D1. The

coils

21 and 22 have a rectangular shape with the direction D3 being the longitudinal direction, that is, the direction D3, when viewed from the direction of the center axes O1 and O2, that is, the direction D1. The four corners of the rectangular shape have an arc shape. The number of turns of coil 21 is the same as the number of turns of coil 22. The number of turns of each of the

coils

21 and 22 can be changed as appropriate according to design or the like. The number of turns of the coil 21 may be a number different from the number of turns of the coil 22. However, the number of turns of the coil 21 and the coil 22 is preferably the same from the viewpoint of suppressing variation in the waveform shape of the current flowing through the reactor 1, the viewpoint of controlling the current flowing through the reactor 1, the viewpoint of improving ease of installation of the reactor 1 at the time of installation, and the like. The

coils

21 and 22 are not limited to the conductive wires having a flat cross section, and may be formed of conductive wires having a circular cross section.

In the present embodiment, both

end portions

211A, 212A of the winding portion 210 of the coil 21 are aligned in the direction D1 of the central axis O1. Both

end portions

211A, 212A of the winding portion 210 are located on the opposite side of the coil 22 with respect to the central axis O1 and face the core leg portion 303.

In the present embodiment, both

end portions

221A, 222A of winding portion 220 of coil 22 are aligned in direction D1 of central axis O2, and both

end portions

221A, 222A of winding portion 220 are located on the opposite side of coil 21 with respect to central axis O2 and face core leg portion 303.

Further, in the present embodiment, the coil unit 2 including the

coils

21 and 22 has a 2-fold rotational symmetry relationship about an axis O3 between the

coils

21 and 22, which is perpendicular to the direction D1, which is the central axis O1 of the coil 21. The axis O3 is perpendicular to the directions D1, D2 and parallel to the direction D3. The axis O3 preferably passes through the midpoint of a line segment extending in the direction D2 connecting the central axes O1 and O2, but is not limited thereto.

Specifically, as shown in fig. 1 to 3C, the terminal portions 211 of the coil 21 extend from the end portions 211A of the winding portion 210 in the direction D2, and are curvedly drawn along the direction D3. Terminal portion 212 is substantially linearly drawn in direction D3 from end portion 221A of winding portion 210 opposite to end portion 211A. The terminal portion 221 of the coil 22 is substantially linearly drawn from the end portion 221A of the winding portion 220 in the direction D3. The terminal portion 222 extends in the direction D2 from an end portion 222A of the winding portion 220 opposite to the end portion 221A, and is drawn out in a curved manner in the direction D3.

Therefore, the terminal portion 211 of the coil 21 half-rotated about the axis O3 coincides with the terminal portion 222 of the coil 22. The terminal portion 212 of the coil 21 half-rotated about the axis O3 coincides with the terminal portion 221 of the coil 22.

Thus,

terminal portions

211 and 221 in coil 21 and coil 22 are arranged outside core leg 303 of core 3 so as to face each other with core leg 303 interposed therebetween and in direction D3.

Terminal portions

212 and 222 in coil 21 and coil 22 are arranged in direction D3 so as to face each other with core leg 303 sandwiched therebetween outside core leg 303 in core 3. For example, as shown in fig. 2D, in the reactor 1, both the two

terminal portions

211, 212 of the coil 21 and the two

terminal portions

221, 222 of the coil 22 are arranged on the same side of the core 3 outside the core leg portions 303.

Fig. 3D is a circuit diagram of the power supply circuit 100 including the reactor 1. In the power supply circuit 100, the terminal portion 211 of the coil 21 and the terminal portion 221 of the coil 22 of the reactor 1 are connected to the same external circuit 101, and the terminal portion 212 and the terminal portion 222 are connected to the same external circuit 102. Specifically, the terminal portion 211 of the coil 21 of the reactor 1 is connected to the input terminal T11 as a terminal connected to the external circuit 101, and the terminal portion 221 of the coil 22 is connected to the input terminal T12 as a terminal connected to the external circuit 101. The terminal portion 221 of the coil 21 of the reactor 1 is connected to an output terminal T21 serving as a terminal connected to the external circuit 102, and the terminal portion 222 of the coil 22 is connected to an output terminal T22 serving as a terminal connected to the external circuit 102.

Fig. 3E is a side view of the power supply circuit 100. The power supply circuit 100 further includes a circuit board 103 on which the reactor 1 and the

external circuits

101 and 102 are mounted. The

terminal portions

211, 212, 221, and 222 of the reactor 1 are connected to the circuit board 103 with a bonding material 104 such as solder. Since the

terminal portions

211, 212, 221, and 222 are drawn out from the core body 3 in the same direction in a short distance to the circuit board 103, the

terminal portions

2111, 212, 221, and 222 can be electrically uniformly and easily connected to the circuit board 3. In the reactor 1, the terminal portion 211 of the coil 21 and the terminal portion 221 of the coil 22 connected to 1 external circuit 101 face the same direction on the same side with respect to the reactor 1, and the terminal portion 212 of the coil 21 and the terminal portion 222 of the coil 22 connected to 1 external circuit 102 face the same direction on the same side with respect to the reactor 1, so that the reactor 1 can be easily connected to the

external circuits

101 and 102.

The core 3 has a coupling magnetic circuit that magnetically couples the

coils

21, 22 to each other. The coupled magnetic circuit is constituted by

core leg portions

301 and 302 and connecting

portions

304 and 305. Further, the core 3 has a non-coupled magnetic path through which the magnetic flux generated by the coil 21 passes. The non-coupled magnetic circuit is constituted by

core leg portions

301 and 303 and connecting

portions

304 and 305. The core 3 also has a non-coupled magnetic path through which the magnetic flux generated by the coil 22 passes (see fig. 3B and 3C). The non-coupled magnetic circuit is constituted by

core leg portions

302 and 303 and connecting

portions

304 and 305. For example, in the core 3, since a current flows in the coil 21, as shown in fig. 3B and 3C, a magnetic flux Y11 is generated. In addition, the magnetic flux Y11 is only a conceptually illustrated magnetic flux, and the magnetic flux passing through the uncoupled magnetic circuit is not limited thereto.

The direction of the dc magnetic flux generated by the

coils

21 and 22 is determined by the winding direction of the

coils

21 and 22 and the direction of the dc current flowing through the

coils

21 and 22. The dc magnetic flux here is a magnetic flux generated by a dc current flowing through the

coils

21 and 22. One

terminal portions

211 and 221 of the

coils

21 and 22 are electrically connected to connection portions T11 and T12, respectively, which are high-potential-side input terminals in the external circuit 101. The

other end portions

212 and 222 of the

coils

21 and 22 are electrically connected to the connection portions T21 and T22, respectively, which are low-potential-side input terminals of the external circuit 102 (see fig. 3D). Therefore, in the coupled magnetic circuit, the direction of the dc magnetic flux generated by the coil 21 when the coil 21 is energized and the direction of the dc magnetic flux generated by the coil 22 when the coil 22 is energized are opposite to each other. Therefore, in the coupled magnetic circuit formed by the core 3, the direct-current magnetic flux generated by the coil 21 and the direct-current magnetic flux generated by the coil 22 are in opposite directions to each other and cancel each other out.

In this way, the

coils

21 and 22 are magnetically coupled to each other through the coupling magnetic path formed by the core 3. In other words, the core 3 magnetically couples the

coils

21, 22 to each other. That is, the core 3 realizes a magnetic coupling function for magnetically coupling the

coils

21 and 22 to each other. The core 3 stores, as magnetic energy, magnetic flux passing through the uncoupled magnetic circuit, among magnetic fluxes generated by the coil 21, for example. That is, the core 3 realizes an inductor function of accumulating or discharging magnetic energy generated by the coil 21.

In the above, although the case where the current flows through the coil 21 is described, similarly, when the current flows through the coil 22, the core 3 stores, as magnetic energy, magnetic flux passing through the non-coupled magnetic circuit among magnetic fluxes generated by the coil 22. That is, the core leg portion 302 realizes an inductor function of accumulating or discharging magnetic energy generated by the coil 22.

(2-2) second embodiment

Fig. 4 is an external perspective view of a reactor 1A according to a second embodiment. Fig. 5A, 5B, and 5C are a top view, a front view, and a side view of the reactor 1A, respectively. Fig. 6A is a sectional view of the reactor 1A shown in fig. 5A to 5C at the line VIA-VIA. Fig. 6B is a sectional view at line VIB-VIB of the reactor 1A shown in fig. 5A to 5C. Fig. 6C is a sectional view of the reactor 1A shown in fig. 5A to 5C taken along line VIC-VIC. Hereinafter, the same components as those of the reactor 1 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

The reactor 1A of the present embodiment also includes the

coils

21 and 22 and the core 3. The

coils

21, 22 constitute the coil section 2.

The

coils

21 and 22 of the coil unit 2 are wound around central axes O1 and O2 extending in the direction D1, respectively. The

coils

21 and 22 are arranged in a direction D2 perpendicular to the direction D1. The direction D3 is perpendicular to the directions D1, D2.

The core 3 has

core leg portions

301, 302, 303 and connecting

portions

304, 305. As shown in fig. 4, in the present embodiment, in the core 3, the

core leg portions

301, 302, 303 are integrally formed. The

core legs

301, 302, 303 extend in the direction D1. The

core legs

301, 302 are aligned in the direction D2. The combination of

core legs

301, 302 and core leg 303 are aligned in direction D3.

Each of the

connectors

304, 305 has an octagonal shape having two long sides extending in the direction D3 and facing each other, two short sides extending in the direction D2 shorter than the long sides and facing each other, and four oblique sides connecting the long sides and the short sides, as viewed in the direction D1 (see fig. 5A).

The connecting

portions

304, 305 are arranged with a space therebetween in the direction D1. One end portion of each of the

core leg portions

301, 302, 303 in the direction D1 is connected to the connecting portion 304. The other end portions of the

core leg portions

301, 302, and 303 in the direction D1 are connected to the connecting portion 305. That is, the

core leg portions

301, 302, 303 are connected to each other by the connecting

portions

304, 305.

Both ends of the core leg 301 are connected to one long side of the connecting portion 304 and the long side of the connecting portion 305 facing the long side in the direction D1. Both ends of the core leg portion 302 are connected to a long side of the connecting portion 304 other than the long side connected to the core leg portion 301 and a long side of the connecting portion 305 facing the long side in the direction D1 other than the long side connected to the core leg portion 301. Both ends of the core leg portion 303 are connected to one short side of the connecting portion 304 and the short side of the connecting portion 305 opposed thereto, respectively. Between each oblique side of the connecting portion 304 and the oblique side of the connecting portion 305 opposed thereto in the direction D1, there is an opening connected to the space between the connecting portion 304 and the connecting portion 305.

The core leg 301 is disposed inside the coil 21. The core leg portion 302 is disposed inside the coil 22. The core leg 303 is disposed outside the

coils

21 and 22. That is, the core leg portion 303 is not disposed inside any of the

coils

21, 22.

A cross section of each of the

core leg portions

301 and 302 orthogonal to the direction D1 has a rectangular shape in fig. 6A, which has an arc shape at least in a part of a peripheral edge portion and is long in the direction D3. The cross section is not limited to this, and may have another shape such as a rectangular shape or a circular shape.

In the present embodiment, for example, as shown in fig. 5A and 6A, the contour 301L of the surface 301S of the core leg portion 301 of the core 3, which surface appears in a cross section perpendicular to the central axis O1 of the coil 21 and faces the core leg portion 303, describes a curve protruding toward the core leg portion 303. Further, an outline 302L of a surface 302S of the core leg portion 302, which surface faces the core leg portion 303 and appears in a cross section perpendicular to the central axis O2 of the coil 22, describes a curve protruding toward the core leg portion 303. Further, the contour 303L1 of the surface 303S1 of the core leg portion 303, which appears in a cross section perpendicular to the central axis O1 of the coil 21 and faces the core leg portion 301, describes a curve that is concave toward the side opposite to the core leg portion 301. Further, the contour 303L2 of the surface 303S2 of the core leg portion 303, which appears in a cross section perpendicular to the central axis O2 of the coil 22 and faces the core leg portion 302, describes a curve that is concave to the side opposite to the core leg portion 302.

That is, the core leg portion 301 has a surface 301S facing the core leg portion 303. A profile 301L of a surface 301S of the core leg 301 included in a cross section of the core leg 301 in a plane PL perpendicular to the direction D1 is a curved line bulging toward the core leg 303. The core leg portion 302 has a surface 302S opposed to the core leg portion 303. A cross section of the core leg portion 302 in the plane PL includes a contour 302L of a face 302S of the core leg portion 302 which is a curve bulging toward the core leg portion 303. The core leg portion 303 has a surface 303S1 and a surface 303S2 that face the surface 301S of the core leg portion 301 and the surface 302S of the core leg portion 302, respectively. A contour 303L1 of a surface 303S1 of the core leg portion 303 included in a section of the core leg portion 303 in the plane PL is a curve that is concave to the side opposite to the core leg portion 301. The contour 303L2 of the surface 303S2 of the core leg 303 included in the cross section of the core leg 303 is a curve that is concave to the side opposite to the core leg 302.

With the above configuration, in the reactor 1 of the present embodiment, the number of portions where magnetic flux is locally concentrated in the

core leg portions

301, 302, 303 can be reduced. In this case, the reactor 1 can be easily connected to an external circuit, and the effect of canceling magnetic flux can be ensured. Further, even if the reactor 1 is connected to an external circuit, the current can be easily controlled.

Further, the contour 301L of the surface 301S of the core leg portion 301 may have a circular arc shape. The contour 303L1 of the surface 303S1 of the core leg portion 303 may have an arc shape concentric with the arc shape of the contour 301L of the surface 301S of the core leg portion 301. The contour 302L of the face 302S of the core leg portion 302 may also have a circular arc shape. The contour 303L2 of the surface 303S2 of the core leg portion 303 may have an arc shape concentric with the arc shape of the contour 302L of the surface 302S of the core leg portion 302. With this configuration, the above-described effects can be more reliably obtained.

In addition, the shapes of the

contours

301L, 302L, 303L1, 303L2 of the

surfaces

301S, 302S, 303S1, 303S2 of the

core legs

301, 302, 303 in the core 3 are not limited thereto.

The core 3 is integrally formed as shown in fig. 4, for example. The integration is not limited to the one-piece structure, and includes a structure in which a plurality of members are joined together with an adhesive or the like. The material forming the core 3 may be the same as that of the first embodiment. The core 3 may have the same structure as that of the first embodiment described above.

In the present embodiment, the coil 21 is formed of a conductive wire that is wound around the core leg 301 with the core leg 301 as the center and has a flat cross section. The coil 22 is formed of a conductive wire that is wound around the core leg 302 with the core leg 302 as the center and has a flat cross section.

The direction of the central axis O1 of the coil 21 and the direction of the central axis O2 of the coil 22 are both directions D1. The

coils

21 and 22 are arranged in a direction D2 perpendicular to a direction D1 of the center axis O1 of the coil 21. As shown in fig. 4 to 6C, the direction D2 is perpendicular to the direction D3.

In the present embodiment, the

terminal portions

211, 212 of the coil 21 are drawn out from the

end portions

211A, 212A of the winding portion 210 in opposite directions parallel to the direction D3, respectively. Further, the

terminal portions

221, 222 of the coil 22 are drawn out from the

end portions

221A, 222A of the winding portion 210, respectively, in mutually opposite directions parallel to the direction D3 (refer to fig. 4 to 6C). That is, in the present embodiment, the

terminal portions

211 and 212 of the coil 21 in the reactor 1 are drawn from the

respective end portions

211A and 212A of the winding portion 210 in the direction D3 perpendicular to both the direction D1 of the central axis O1 of the coil 21 and the direction D2 in which the

coils

21 and 22 are arranged, as viewed from the direction D1. The

terminal portions

221 and 222 of the coil 22 are drawn out from the winding portion 220 of the coil 22 from both ends in a direction orthogonal to both the direction of the central axis O2 of the coil 22 and the direction in which the

coils

21 and 22 are arranged.

In the reactor 1A in the present embodiment, the

coils

21, 22 have the same shape. In particular, in the present embodiment, the

coils

21 and 22 are in a relationship of translational symmetry under a translation operation in a direction parallel to the direction D2 in which the

coils

21, 22 are arranged. Specifically, as shown in fig. 4 to 6C, the

terminal portions

211, 212 of the coil 21 are each drawn out curvedly, the

terminal portions

211, 212 being on opposite sides to each other with respect to the central axis O1 in the direction D3, and being on opposite sides to each other with respect to an axis in the direction D2 orthogonal to the central axis O1 in the direction D1. In addition, the

terminal portions

221, 222 of the coil 22 are each drawn out in a curved manner, and the

terminal portions

221, 222 are on opposite sides with respect to the central axis O2 in the direction D3 and on opposite sides with respect to an axis in the direction D2 orthogonal to the central axis O2 in the direction D1.

That is, the terminal portion 211 of the coil 21 on which the translation operation in the direction parallel to the direction D2 is performed coincides with the terminal portion 221 of the coil 22. Further, the terminal portion 212 of the coil 21 on which the translation operation in the direction parallel to the direction D2 is performed coincides with the terminal portion 222 of the coil 22.

In this manner, in the reactor 1 of the present embodiment, the

terminal portions

211 and 221 of the

coils

21 and 22 can be arranged from the core 3 toward the same side. Further, the terminal portion 212 of the coil 21 and the terminal portion 222 of the coil 22 may be disposed in the same direction from the core body 3 on the opposite side of the

terminal portions

211 and 221.

Therefore, when the reactor 1A is connected to the

external circuits

101 and 102 of the power supply circuit 100 shown in fig. 3D instead of the reactor 1, the terminal portion 211 of the coil 21 and the terminal portion 221 of the coil can be wired on the same side and connected to the external circuit 101. Further, the terminal portion 212 of the coil 21 and the terminal portion 222 of the coil 22 can be wired on the same side and connected to another external circuit 102.

When the reactor 1 is connected to an external circuit, as shown in fig. 3D, the terminal portion 211 of the coil 21 and the terminal portion 221 of the coil 22 in the reactor 1 are connected to the same external circuit (the external circuit 101 in fig. 3D), and the terminal portion 212 and the terminal portion 222 are connected to the same external circuit (the external circuit 102 in fig. 3D). Specifically, in the reactor 1, the one terminal portion 211 of the coil 21 is connected to the connection portion T11 of the external circuit 101, and the one terminal portion 221 of the coil 22 is connected to the connection portion T12 of the external circuit 101. Further, in the reactor 1, the other terminal portion 212 of the coil 21 is connected to the connection portion T21 of the external circuit 102, and the other terminal portion 222 of the coil 22 is connected to the connection portion T22 of the external circuit 102. Since the respective terminal portions of the

coils

21 and 22 connected to the

external circuits

101 and 102 are oriented in the same direction, the reactor 1 can be easily connected to the

external circuits

101 and 102.

In particular, in the present embodiment, since the connecting

portions

304, 305 of the core 3 have four oblique sides, the

terminal portions

211, 212, 221, 222 of the

coils

21, 22 are arranged outside the respective opening portions in the core leg portions 303. In other words, in the present embodiment, both of the terminal portions of the

coils

21 and 22 are disposed at positions outside the core 3. Thus, in the reactor 1A of the present embodiment, even if the

coils

21 and 22 have the same shape, the terminal portions are arranged outside the core 3, and therefore, when the reactor 1A is mounted on a wiring board or the like and connected to the

external circuits

101 and 102, routing of the wiring on the wiring board or the like can be further simplified. Therefore, the device including the reactor 1A can be downsized. The shape of the core 3 is not limited to the shape described above, and may be any shape as long as the terminal portions of the

coils

21 and 22 can be disposed toward the outside of the core 3.

(2-3) modification

Modifications of the first and second embodiments are listed below. The modifications described below can be applied in appropriate combination with the above-described embodiments.

In the

reactors

1 and 1A described above, the core leg 301, the core leg 302, and the core leg 303 are integrally formed in the core 3, but may be separate bodies. For example, in the above example, the core leg 301 and the core leg 303 are configured to function as both the coupled magnetic path and the uncoupled magnetic path, but the core leg forming the coupled magnetic path and the core leg forming the uncoupled magnetic path may be configured separately. Similarly, the core leg portion 302 and the core leg portion 303 are configured to function as both the coupled magnetic path and the uncoupled magnetic path, but the core leg portion forming the coupled magnetic path and the core leg portion forming the uncoupled magnetic path may be configured separately. In this case, 2 core leg portions constituting the core leg portion 301 (core leg portion 302) may be joined by an adhesive or the like. The

core leg portions

301, 302, 303 of the core 3 may be made of different materials. For example, when designing the reactor 1, the core leg portion 303 and the

core leg portions

301 and 302 may be configured to have different magnetic permeability from each other, thereby adjusting the coupling coefficient.

In the

reactors

1 and 1A of the above-described embodiments, the

core leg portions

301 and 302 are provided as the non-coupled magnetic paths for realizing the inductor function, but only one of the

core leg portions

301 and 302 may be provided.

The

connection portions

304 and 305 may not have the same shape, and for example, the connection portion 304 may have a rectangular shape, and the connection portion 305 may have another shape such as a polygonal shape other than the rectangular shape.

The

reactors

1 and 1A may further include a bobbin around which the

coils

21 and 22 are wound. The

core legs

301, 302 pass through the bobbin.

In the

reactors

1 and 1A, the

coils

21 and 22 and the core 3 may be integrally sealed by a sealing member such as resin. This can suppress winding displacement of the

coils

21 and 22.

Further, the

core legs

301, 302, 303 may not be integrally and continuously connected. For example, the

core legs

301, 302, 303 may also be partially continuously connected.

Description of the symbols

1: a reactor;

21: a coil (first coil);

22: a coil (second coil);

210: a winding portion (first winding portion);

220: a winding portion (second winding portion);

211. 212, and (3): a terminal portion (first terminal portion);

221. 222: a terminal portion (second terminal portion);

3: a core body;

301: a core leg (first core leg);

302: a core leg portion (second core leg portion);

303: a core leg (third core leg).

Claims

1. A reactor is provided with:

a core body;

a first coil wound around the core around a first central axis extending in a first direction; and

a second coil wound around the core around a second central axis extending in the first direction;

the core has:

a first core leg portion disposed inside the first coil; and

a second core leg portion disposed inside the second coil,

the first coil and the second coil are arranged in a second direction orthogonal to the first direction,

the first coil has:

a first winding portion having both ends, and wound around the first core leg portion from one end to the other end of the both ends; and

two first terminal parts respectively led out from the two end parts of the first winding part,

the second coil has:

a second winding portion having both ends, and wound around the second core leg portion from one end to the other end of the both ends; and

two second terminal portions respectively led out from the two end portions of the second winding portion,

the second coil has the same shape and the same size as the first coil.

2. The reactor according to claim 1, wherein,

the two end portions of the first winding portion are respectively located at two ends of the first winding portion in the first direction,

the two end portions of the second winding portion are respectively located at both ends of the second winding portion in the first direction,

the first coil and the second coil constitute a coil portion,

the coil portions are in a 2-time rotational symmetric relationship centered on an axis passing between the first coil and the second coil and perpendicular to the first direction.

3. The reactor according to claim 1 or 2, wherein,

the core further has: and a third core leg portion disposed outside the first coil and the second coil.

4. The reactor according to claim 3, wherein,

the core further has:

first connecting portions connected to respective one ends of the first leg portion, the second leg portion, and the third core leg portion in the first direction, respectively; and

and second connection portions connected to the respective other ends of the first leg portion, the second leg portion, and the third core leg portion in the first direction, respectively.

5. The reactor according to claim 1, wherein,

the both end portions of the first winding portion are arranged in a third direction perpendicular to the first direction and the second direction when viewed from the first direction,

the both end portions of the second winding portion are arranged in the third direction as viewed from the first direction,

the first coil is in a translational symmetric relationship with respect to the second coil under a translational operation in the second direction.

6. The reactor according to claim 5, wherein,

the core further has: a third core leg portion disposed outside the first coil and the second coil,

the first core leg has a face opposite the third core leg,

a profile of the face of the first core leg included in a cross section of the first core leg in a plane perpendicular to the first direction is a curve bulging toward the third core leg,

the second core leg has a face opposite the third core leg,

a cross section of the second core leg in the plane includes a contour of the face of the second core leg that is a curve bulging toward the third core leg,

the third core leg has: a first face and a second face respectively opposing the face of the first core leg and the face of the second core leg,

a cross section of the third core leg in the plane includes a profile of the first face of the third core leg that is a curve that is concave to a side opposite to the first core leg,

a contour of the second face of the third core leg included in the cross section of the third core leg is a curve recessed to a side opposite to the second core leg.

7. The reactor according to claim 6, wherein,

the contour of the face of the first core leg has a circular arc shape,

the contour of the first face of the third core leg has an arc shape concentric with the arc shape of the contour of the face of the first core leg,

the contour of the face of the second core leg has a circular arc shape,

the contour of the second face of the third core leg has an arc shape concentric with the arc shape of the contour of the face of the second core leg.

8. The reactor according to claim 6 or 7, wherein,

the core further has:

a first connecting portion connected to one end of each of the first leg portion, the second leg portion, and the third core leg portion in the first direction; and

and a second connection portion connected to the other end of each of the first leg portion, the second leg portion, and the third core leg portion in the first direction.

9. The reactor according to any one of claims 1 to 8,

the reactor further includes:

a first input terminal connected to one of the two first terminal portions of the first coil;

a second input terminal connected to one of the two second terminal portions of the second coil;

a first output terminal connected to the other of the two first terminal portions of the first coil; and

a second output terminal connected to the other of the two second terminal portions of the second coil.

10. The reactor according to any one of claims 1 to 8,

one of the two first terminal parts of the first coil and one of the two second terminal parts of the second coil are configured to be connected to a first external circuit,

the other of the two first terminal portions of the first coil and the other of the two second terminal portions of the second coil are configured to be connected to a second external circuit.